Gem-seat-grooving tool



July 1, 1924. 1,499,818

A. FRANCONETTI GEM SEAT GROOV'ING TOOL Filed Sent. 27, 1922 in settingswhich Patented July 1, 1924.

UNITED AUGUST FRANCONETTI, OF WASHINGTON, DISTRICT OF COLUMBIA.

GEM-SEAT-GROOV'ING TOOL.

Application filed September 27, 1922. Serial No. 590,912.

To all whom it may concern:

Be it known that I, AUGUST FRANooNE'r'rr, a citizen of the UnitedStates, residing at Washington, District of Columbia, have inventedcertain new and useful Improvements in Gem-Seat-Grooving Tools, of whichthe following is a specification.

This invention relates to improvements in devices for forming gemseating grooves in rings and other jewelry where the stones are set inopenings other than round openings, although the device is likewiseadapted for use in grooving round openings for the reception of stones.I

Jewelers experience considerable difficulty in setting oval, square andirregular cuts, due to the fact that the groove upon which the stonemust seat in the setting must be cut by hand, causing the groove to beoften irregular and resulting in many instances are not as perfect asthey should be. For this reason, the setting of odd shaped gems isusually comparatively costly. This invention provides means whereby thegroove of such irregular openings may be cut to a uniform depth both asregards the size of the groove and the spacing of the gem seat from theface of the setting in which the gem is to be placed.

A still further object of the invention is to provide a device of thischaracter which may be very cheaply produced and readily operated, andin the use of which no special tools or accessories are required.

;These and other objects I attain by the construction and arrangementshown in the accompanying drawings wherein for the purpose ofillustration is shown a preferred embodiment of my invention and whereinlike reference characters designate like parts throughout.

In the drawings v Figure 1 is a side elevation partially in sectionshowing a device constructed in accordance with my invention in use forforming a gem seating groove in a ring set opening;

Figure Figure 1;

Figure 3 is a sectional view taken through the shaft showing one mannerof mounting the burr therein, and

Figure 4 is a modified form of burr.

Referring now more particularly to the drawings, the numeral 10indicates a shaft 2 is a section on the line 22 of adapted forengagement in a jewelers lathe and having formed thereon at a pointspaced from the end, or secured thereto as desired, an abutment memberor collar 11. The end of the shaft has either formed thereon or securedthereto a cutter or burr 12, in Figure 1 this burr being'shown as formedintegrally with the shaft and in Figure 3 being illustrated as providedwith a shank 13 inserted in a bore formed in the end of the shaft. Thiscutter is in the form of two cones having their bases disposed againstone another, the outer faces of these cones being provided with teeth,one of the cones being secured either to the shaft 10 or shank 13 as thecase may be. If desired, a cutter such as shown in Figure 4 may beemployed wherein the teeth are formed only on the outer cone of thecutter head.

The numeral 14 designates a member slidably and rotatably mounted uponthe end 'of the shaft 10 in which the cutter 12 is mounted, and adaptedto abut against the collar 11. This member has formed thereon a flange15 which, when the member abuts the collar 11, is flush with the end ofthe,

shaft 10, this flange being 'of considerable size and forming a restagainst which the face of the setting in which the gem receiving openingis formed is placed. That face of the flange next adjacent the burr ishighly polished so that the flange if rotated through the rotation ofthe shaft 10 will not exercise a twisting eflect upon the jewelry heldthereagainst and will not mar the same. With jewelers lathe and rotated,the jewelry in which the seat is'to be formed is placed against theflange 15 and moved against the cutter 12 so that the teeth thereofengage in the side wall of the gem receiving open ing 16 and a groove 17is formed therein. The groove may be regulated as regards its distancefrom the face through which the setting is to be exposed'by means ofwashers 18 or the like placed between the member 14 and the collar 11 toadjust the member 14 longitudinally of the shaft 10.

It has been found in practice that with a structure as above recited,odd shaped stone receiving openings may be readily grooved and in a veryshort space of time when compared with the ordinary hand operation. Itwill be obvious that by varying the shape of the cutter or burr 12, thecharacter of the groove may likewise be altered the shaft 10 placed ina,

to suit the requirements of the work at hand, and I do not accordinglywish to limit myself to the specific construction of the burr or to thespecific structure above recited except as hereinafter claimed.

I claim I. In a device for forming grooves in the 'walls of gemreceiving openings of jewelry comprising a rotatable shaft, a burrcarried by the end of the shaft, and a flange carried by the shaft andadapted for engagement by it of jewelry in which the grooves are to beformed, said flange being adjustable longitudinally of the shaft.

2. In a device for forming grooves in the walls of gem receivingopenings of jewelry comprising a rotatable shaft, a burr carried by theend of the shaft, and a flange carried by the shaft and adapted forengagement by it of jewelryin which the grooves are to be formed,'saidflange being adjustable longitudinally of the shaft, said shaft beingrotatable in said flange.

3. In combination with a burr chucking neeaeie shaft for jewelers lathesand the like and a burr carried thereby,-a stop element carried by theshaft at a point spaced from the burr receiving end thereof, a membermounted on the shaft and abutting the stop member, a flange formed onthe opposite end of the member and having that face thereof nextadjacent the burr highly polished, and means insertible intermediate thefirst named end of the member and the stop element for adjusting themember longitudinally of the shaft.

In testimony thereof I afiix my signature.

AUGUST FRANCQNEIII.

